Iskut River Post Construction Report - a100.gov.bc.caa100.gov.bc.ca/.../documents/r16207/IskutRiverPostConstructionRep… · information, this report will also address any changes

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ENVIRONMENTAL MONITORING POST CONSTRUCTION REPORT

ISKUT RIVER BRIDGE

Prepared for:

Galore Creek Mining Corporation. Prepared by:

WestCan Projects

(Photo of Iskut Bridge Crossing taken in July 2007)

Iskut River Bridge

Environmental Monitor(s): Robert S.J. Bourcier, AScT, P.Ag Date: May28 to July 31, 2007 Colin Scwindt, B.Sc, and Doug Stokes Report Reviewed by: Robert S.J. Bourcier, AScT, P.Ag. Date: November 1, 2007

ENVIRONMENTAL MONITORING POST-CONSTRUCTION REPORT

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TABLE OF CONTENTS

1.0 INTRODUCTION................................ ................................ ................................ .............1

2.0 BACKGROUND................................ ................................ ................................ ..............1

3.0 Monitoring Program................................ ................................ ................................ ......2

3.1 Daily Sequence of Events as Recorded by the On–Site Environmental Monitor ..3

3.1.1 May 20 to 26, 2007 ................................ ................................ .................. 3

3.1.2 May 27 to June 2, 2007................................ ................................ ............5

3.1.3 June 03 to 09, 2007 ................................ ................................ ................. 7

3.1.4 June 10 to 16, 2007 ................................ ................................ ................. 9

3.1.5 June 17 to 23, 2007 ................................ ................................ ............... 10

3.1.6 June 24 to 30 2007 ................................ ................................ ................ 12

3.1.7 July 01 to 07, 2007................................ ................................ ................. 13

3.1.8 July 8 to 14, 2007................................ ................................ ................... 14

3.1.9 July 15 to 21, 2007................................ ................................ ................. 15

3.2.0 July 22 to 28, 2007................................ ................................ ................. 17

3.2.1 July 29 to August 04, 2007................................ ................................ .....18

3.2.2 August 04 - 26, 2007................................ ................................ .............. 19

*****DFO STOP WORK ORDER ISSUED UNTIL FURTHER NOTICE*****................... 19

3.2.3 August 26 to September 01, 2007................................ .......................... 20

3.2.4 September 02 to September 08, 2007................................ .................... 21

3.2.5 September 09 to September 15, 2007................................ .................... 23

4.0 FINAL SITE AUDIT................................ ................................ ................................ .......23


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5.0 REFERENCES................................ ................................ ................................ .............. 24

APPENDIX A – PHOTOS................................ ................................ ................................ .........25

APPENDIX B – TURBIDITY MONITORING RESULTS................................ ............................ 31

Turbidity Monitoring Table – Iskut River................................ ................................ ............... 31

APPENDIX C – pH MONITORING RESULTS................................ ................................ ..........34

pH Monitoring Form – Iskut River................................ ................................ .......................... 34

APPENDIX D – FINAL INSPECTION ENVIRONMNETAL CHECKLIST................................ ..35


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1.0 INTRODUCTION

This summary As-built report has been written at the request by Galore Creek Mining Corporation (GCMC) by the Independent Environmental Monitors responsible for the bridge construction – WestCan Projects (WestCan).

This document is required by the Department of Fisheries and Oceans (DFO) to comply with Section 5.1 of the DFO Authorization for Works or Undertakings Affecting Fish habitat; Authorization No.1 04-HPAC-PA1-000-000021 (herein referred to as the Authorization). The purpose of this document is to describe in detail the construction and environmental monitoring activities that occurred between May 20 to September 12, 2007 during the installation and construction of the temporary work platform and permanent bridge over the Iskut River. This report will review construction activities (in order of occurrence) with particular attention and detail to instream works associated with the project. In addition to the aforementioned information, this report will also address any changes that were made to the original Site Construction Plan and Practices as a result of unforeseen construction difficulties or prolonged periods of adverse weather conditions.

2.0 BACKGROUND The Iskut River is a tributary of the Stikine River and is located at kilometer 15+600 on the Devil’s Creek Forest Service Road (FSR)

Figure 1. Location of the Iskut River Bridge Crossing on Devil’s Creek FSR.

The crossing structure at this location is a steel girder bridge with pier, approximately 109.7m in length. The installation of this bridge is to facilitate the transportation of mining goods and services to and from the mine during the life of the mine. A temporary work platform was also installed to aid


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In the construction of instream works (pile driving of pier grouping) as the original temporary access was not suitable due to existing site conditions. 3.0 MONITORING PROGRAM

The following is a description of the Independent Environmental Monitors (EM) Roles and Responsibilities as per GCMC contract standards and WestCans own set of criteria to meet or exceed these roles and responsibilities. In GCMC’s “Construction Environmental Standards and Guidelines” March 4 edition and latest August 13 edition. The EM’s roles and responsibilities were as follows:

• Ensure that the Environmental Coordinators, Galore Creek Construction are notified immediately of all potential non-compliance issues.

• Ensure that day to day filed related activities that require environmental monitoring are being undertaken in accordance with direction from the Environmental Coordinators.

• Have the authority to shut down a project if there is non-compliance and/or infraction until that non-compliance issue and/or infraction is rectified.

• Conduct environmental assessments ahead of the construction team in the field as required within his or her area of expertise and upon the advice of the Environmental Coordinator(s)

• Provide advice to the construction team, contractors etc. in the field within his or her area of expertise and seek advice from senior environmental team members as needed.

WestCan has ensured that all of the aforementioned roles and responsibilities were met on this project by providing qualified EM(s) that have experience working with road and bridge building projects. In addition we also conduct our own “in house” training ensuring that the EM (s) are aware of the project(s) status, on site contractors and GCMC staff to be contacted in case of an emergency. These site-specific details are either shared verbally, in writing (cross over notes) or in person. The criteria that our staff are continuously monitoring for are as follows:

• Is the contractor completing the installation as per the Environmental Management Plan (EMP) and General Arrangement Drawings

• Do they have a copy of all necessary permits on site • Is the contractor applying all Best Management Practices as per the EMP • Is the contractor using heavy machinery that has been cleaned of deleterious substances • Are all sediment and erosion control measures installed as per the schedule and correctly • Are all sediment and erosion control measures checked periodically, and maintained on a

weekly basis and more readily during intense precipitation events


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All of the aforementioned criteria are tracked and documented from the project’s start to completion. WestCan has a series of documents that include, daily journal(s), turbidity monitoring table(s), fish absence and presence table(s) that are used to record the affects of the various construction activities on-site. Additionally, WestCan also provides aid in site isolation, and fish salvage as needed throughout the project. These items would have been recorded in the daily journal notes The following section details the daily events as observed by the Environmental Monitor (EM) while on-site. Appendix A shows a detailed photo log of these events and Appendix B includes the monitor’s daily journals. Appendix C summarizes the turbidity monitoring results for the entire project. Appendix D contains the Final Environmental Audit.

3.1 Daily Sequence of Events as Recorded by the On–Site Environmental Monitor

3.1.1 May 20 to 26, 2007

Weather conditions during this week:

MAX TEMP : 21.1 °C

MAX TEMP. DATE May.24 2007

MIN TEMP : -3.2 °C

MIN TEMP. DATE May.23 2007

PRECIP ACCUMULATION

3.8 mm

May 22, 2007

Construction Activity • Pre-work meeting with contractor, initial site visit with GCMC Environmental

Group on May 22 (Kelly Franz, Scott Davidson, Bob Parolin McElhanney, Dan Brooks Amec, Rob Bourcier, Doug Stokes WestCan Projects).

• Discussed roles and responsibilities of environmental monitors and gathered fish and fish habitat information at the site for the mitigation plan (Refer to Appendix A for photos.

• Low fish and fish habitat present at this location within the proposed footprint.


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May 23, 2007

Construction Activity • installation of Bubble Curtain and lock block foundations for temporary work platform • Held pre work meeting with groups as to preparing works within the Iskut channel on the dry gravel bar, all Sigfusson Northern, McElhanney were in attendance during this meeting. • Established level working footprint for lock blocks, bubble curtain placement also occurred lat morning. • Lock blocks flown ion shortly thereafter for temporary work bridge foundation.

Environmental Issues/Concerns

• No environmental issues or concerns on-site this day. All works occurred on the dry gravel bar, with the exception of the Bubble Curtain, which was placed within the wetted channel using a helicopter. No sediment release was noted during this process.

May 24, 2007

Construction Activity

• All instream works completed May 23. Cutting down road right of way (RoW) up to the Iskut River on either side or approach.


• No environmental issues or concerns on-site this day. No trees should felled into the Iskut River; all trees felled away from the watercourse.

• May 25, 2007

Construction Activity • No activity onsite.


• No environmental issues or concerns on-site this day.


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3.1.2 May 27 to June 2, 2007


MAX TEMP : 22.2 °C

MAX TEMP. DATE Jun.2 2007

MIN TEMP : 0.9 °C

MIN TEMP. DATE Jun.1 2007

PRECIP ACCUMULATION

1.6 mm

May 27-28, 2007

Construction Activity • None on this day


• No environmental issues or concerns on-site this day. Navigable Waters construction signs put up both upstream and downstream of construction footprint.

May 29, 2007

Construction Activity • Contractor crew beginning to mobilize to site, assembling of crane, excavators etc. • Held pre work meeting with Formula crew as to working within the Iskut channel on the dry gravel bar.


• No environmental issues or concerns on-site this day.

May 30, 2007 Construction Activity

• No construction activities commenced on-site as of this day


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• No environmental issues or concerns on-site this day. Approached GCMC Environmental Department, Scott Davidson and Area Road Managers for an additional Environmental monitor as Doug Stokes Occupational Health and Safety Coordinator/Environment is occupied in meetings throughout the day and cannot fly out to site early with crews prior to commencement of works. As contractor will be starting instream works soon WestCan would like to have additional environmental representation on-site.

May 31, 2007

Construction Activity • No construction activities commenced on-site as of this day


• No environmental issues or concerns on-site this day. WestCan has submitted the “Emergency Site Isolation and Flood Mitigation Plan for the Iskut River Crossing Galore Creek Mine Access Road” (May 2007) as per GCMC’s request. Please refer to site-specific details as per the mitigation plan submitted on this day.

June 02, 2007

Construction Activity • Limited construction activities commenced on-site today. Crew has completed

assembly of all heavy machinery on-site including crane on high chain abutment. • Crane placed concrete lock block abutment for the launch of first 50-foot span of

temporary bridge as per the “Emergency Site Isolation and Flood Mitigation Plan for the Iskut River Crossing Galore Creek Mine AccessRoad” and (see Appendix A photos).


• No environmental issues or concerns on-site this day. The portable generator and air compressor were placed near top of riverbank in preparation of bubble curtain usage. River water levels have risen throughout the day. Based on current weather conditions during this week, June 2 was the warmest day on record, which would account for the rise in water levels.


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3.1.3 June 03 to 09, 2007


MAX TEMP : 29.2 °C


MIN TEMP : -1.1 °C


PRECIP ACCUMULATION

11.6 mm

June 03, 2007

Construction Activity • Construction started on this day. Crew has begun installing temporary work

platform. Water levels have risen several centimeters over the course of the day. • Crew began removing concrete lock block abutment as the river was beginning to

scour beneath the abutments. The current design was unsafe due to the stability of the temporary work platform. The temporary abutment design will have to be redesigned due to the high waters (see Appendix A photos).


• Environmental issues and/or concerns on-site this day. The concrete lock blocks had to be removed due to rising water levels within the Iskut River. Background turbidity levels during the removal of the lock blocks were already high, little changes in turbidity were observed while removing the lock blocks.

• The bubble curtain that was initially installed at the center pier location and pinned with concrete lock blocks has moved downstream as a result of the fast moving river current and high waters. The bubble curtain will have to be retrieved at a later date when the waters receded. Please refer to “Site Construction Plan for Remediation Works” discussed in Section 3.2.4, 3.2.5 respectively.

• A new bubble curtain will have to be designed as a result of losing the other bubble curtain in order to proceed with instream works and construction timeline.


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• Silt fencing was installed at the base of the high chain approach as a proactive measure due to the heavy rains incurred over night. No signs of erosion or sediment entering the Iskut River

June 04, 2007

Construction Activity • Stop work order issued on low chain approach due to the lack of design for jump

span approach and all instream works occurring on the high chain approach must also cease as per personal communication with Scott Davidson and Dianna Stoopnikoff (GCMC).


• Stop Work Order issued until a new construction plan and practices are submitted to GCMC by Formula showing a new design and mitigation measures to install temporary work platform. Formula removed all remaining temporary work platform materials from the Iskut River prior to the issuance of the Stop Work Order by GCMC.

June 05-09, 2007

Construction Activity • Stop work order still in effect. The contractor has not been on-site for the past 4

days. EM ensured that all sediment and erosion control measures were functioning as intended throughout the shutdown period. Site was stable throughout the shutdown.


• No environmental issues noted throughout this week.


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3.1.4 June 10 to 16, 2007


MAX TEMP : 19.9 °C


MIN TEMP : 2.6 °C


PRECIP ACCUMULATION

14.6 mm

June 10-14 Construction Activity

• Stop Work Order still in effect. Crew working outside wetted on top of bank mobilizing building materials for both approaches. No heavy machinery has been working at or near the Iskut River.


• Site has been monitored throughout the shutdown period. All sediment and erosion control measures were functioning as intended


• Stop Work Order has been lifted, contractor now allowed to continue working on both approaches to the bridge. Crew commenced pile driving of temporary work platform piles following the guidelines set forth in the “Emergency Site Isolation And Flood Mitigation Plan for the Iskut River Crossing Galore Creek Mine Access Road” (May 2007) approved by GCMC and DFO.


• A qualified construction monitor continuously monitored the site. Turbidity readings were taken throughout the day in coordination with the pile driving activities. First set of piles to be driven were located within Iskut back channel.


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These piles were driven in isolation using the bubble curtain (see Appendices A and B). All sediment and erosion control measures were functioning as intended

• Another 2 pair of piles was driven on the dry gravel bar. The bubble curtain was not used during this phase.

• An additional five deck panels were also installed on this day. • No environmental issues or concerns noted on the first day of construction.

3.1.5 June 17 to 23, 2007

Weather conditions on this day:

MAX TEMP : 19.9 °C


MIN TEMP : 2.5 °C


PRECIP ACCUMULATION

23.8 mm

June 17-18, 2007 Construction Activity

• Contractor continued driving temporary work platform piles until 12:30pm on this day on the high chain approach

• Contractor experiencing crane delays due to repairs, also delayed by helicopter delivery of materials to site

• Stop Work Order issued again due to safety on site • Stop Work Order no longer in effect based on safety measures installed on June

18, 2007

Environmental Issues/Concerns • Contractor advised to have spill containment for welders when placed within the

Iskut River channel regardless of location (i.e. dry gravel bar). Contractor quickly outfitted welders with a secondary means of containment and also had spill kits on site as a proactive measure.


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June 19-23, 2007 Construction Activity

• Contractor continued driving temporary work platform piles on these days on the high chain approach. Once this procedure was complete contractor started building the diaphragm/jig as a template for the main pier grouping.

• Contractor has excavated the low chain in order to proceed with installation of jump span.

• Excavated footing location to pour mudsill and completed concrete formwork for spread footing.

• Contractor approached by GCMC to provide a concrete wastewater management plan. In turn the contractor asked that WestCan write up a plan covering all of the associated environmental issues concerning the cast in place concrete procedures.

• Concrete Wastewater Management plan submitted to GCMC during this period and accepted.

Environmental Issues/Concerns Low chain approach

• Contractor approached WestCan to write and develop a concrete wastewater management plan.

• Plans submitted to GCMC and approved by Scott Davidson and Dianna Stoopnikoff as per conversation with DFO. Contractor began concrete pour on June 23 at 09:00 hours.

• A pre-work was held amongst the contractor, concrete subcontractor and Rescan that morning. Site isolation was completed prior to the concrete pour,

• Contractor had CO2 canister and necessary deployment equipment on site (see Appendix A Photos)

• Continuous pH monitoring was completed during the concrete pour. No noticeable differences in pH were detected. Please refer to Appendix C for pH values recorded. No concrete or concrete wastewater was introduced to the Iskut River.

High chain approach

• Contractor experiencing difficulties due to buried concrete lock blocks. A pair of lock blocks was removed from the main pier grouping location. These lock blocks had been buried during the earlier high water event that occurred on June 3rd and 4th of this month.


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3.1.6 June 24 to 30 2007


MAX TEMP : 20.1 °C


MIN TEMP : 5.6 °C


PRECIP ACCUMULATION

8.4 mm


• Contractor continued driving piles at the main pier grouping location. • Bubble curtain was used during all instream pile driving • Concrete formwork was installed to pour second lift of concrete over mudsill at

low chain approach Environmental Issues/Concerns

• No environmental concerns noted on site during these days, all works that took place at both approaches were completed in isolation of the Iskut River.

• The second concrete pour was not monitored for pH, as the mudsill was located above the natural ground water table at the time of the pour and naturally isolated from the Iskut River (large rock formation and surrounding earth walls

• All pile driving occurred in isolation as contractor used bubble curtain, turbidity monitoring was conducted during all subsequent pile driving activities.

• All instream pile driving was completed during this recording period

• No environmental issues or concerns were noted during the entire procedure (refer to Appendix B for Turbidity Data)


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3.1.7 July 01 to 07, 2007


MAX TEMP : 19.9 °C

MAX TEMP. DATE Jul.7 2007

MIN TEMP : 1.8 °C

MIN TEMP. DATE Jul.7 2007

PRECIP ACCUMULATION

3.8 mm

July 01 Construction Activity

• Contractor continued with installation of jump span. Piers were bolted and cross-braced; the entire spread footing was then backfilled and compacted as per the engineered drawing. Once backfilled the ballast wall was then fastened to the jump span pier grouping.

• Main pier grouping was aligned and the bent cap was welded onto existing piles

Environmental Issues/Concerns • No environmental issues or concerns noted today

July 02-03 Construction Activity

• Contractor continued working on main pier grouping stiffening main pier grouping and welding cross bracing as per engineered drawings. Preparation for bridge launch from low chain approach.

• High chain abutment piles were also driven during this period. No isolation was required as the piles were located well out of the Iskut River.


• No environmental issues or concerns noted during the last couple of days


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July 06-07 Construction Activity

• Contractor continued working on low chain approach in preparation for bridge launch from this location.

• Contractor has been bolting steel girders together for past couple of days

Environmental Issues/Concerns • No environmental issues or concerns noted during the past couple of days

3.1.8 July 8 to 14, 2007


MAX TEMP : 27.7 °C


MIN TEMP : 4.4 °C


PRECIP ACCUMULATION

10 mm

Construction Activity

• Contractor continued bolting steel girders and launching bridge out and over the Iskut River during the entire week of July 8 through to July 14.

• Site clean up (haul dunnage and debris from site)

Environmental Issues/Concerns • No environmental issues or concerns noted throughout the week


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3.1.9 July 15 to 21, 2007


MAX TEMP : 24.6 °C


MIN TEMP : 5.1 °C


PRECIP ACCUMULATION

61.2 mm

July 15, 2007 Construction Activity

• Installation of stiffeners to cross bracing. • Girders were bolted together. Engineer on-site to inspect that the bolts were

torqued to adequate pressure • Construction of a trail within existing construction footprint to the abutment

face for crane access to launch the swift water rescue boat.

Environmental Issues/Concerns • Silt fence was installed along the upstream side of the low chain approach to

prevent any runoff from reaching riparian area and the Iskut River.

July 16-18, 2007 Construction Activity

• Continuation of bridge launching. One section was pushed out today but bridge and the rollers need to be lifted to proceed any further.

• A set of bridge rollers was transported from low chain to high chain to be installed on the high chain abutment to aid in landing the bridge.


• No instream works took place on this day. No environmental concerns noted.


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• Girders were fastened to abutments to create a stable safe platform on which to place bridge decking.

• An approved riprap source at 6.5km was used to supply the necessary armoring for the low chain abutment.


• No instream works were taking place today. • No environmental concerns noted


• Temporary work bridge was being removed and readied for transportation to the construction site at the More Creek Bridge location

• Spread footings on the low chain side are backfilled and returned to a natural state.

• High chain approach to bridge is being developed to join bridge with high chain roadway.

• Works still outstanding within the Iskut River channel include removal of temporary work piles, before this can happen the sheeting must be completed on the pier grouping.


• Removal of work pilings will only go ahead once water levels have receded due to safety and environmental concerns.

• Both high and low chain approaches need a birding and archaeological survey prior to removing material for road construction.

• All work occurring outside of wetted perimeter, no concerns noted.


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3.2.0 July 22 to 28, 2007


MAX TEMP : 21.4 °C


MIN TEMP : 2.9 °C


PRECIP ACCUMULATION

23 mm


• Low chain approach was being filled with material and compacted. Each layer of fill is approximately 300mm as per engineeredspecifications.

• High chain approach is awaiting fill material to build the required ramp to the bridge deck.

• Riprap is placed along low chain approach to protect fill material in event of heavy rains and or high water. The riprap is locked in place with the excavator and is placed on top of filter cloth/geotextile fabric as per requirements.

• Bridge running decks are resurfaced in anticipation of future traffic.

Environmental Issues/Concerns • No instream works were taking place on this day within the wetted perimeter of

the river so no concerns were noted.

• Crew was reminded to pack all garbage offsite to designated disposal facilities on a daily basis not to attract wildlife.

• Also noted that Koehring Carne located at low chain approach staging area was seeping motor oil. Contractor was instructed by EM to remove off site as the machine was not suitable to work on-site. Contractor had it removed shortly thereafter (refer to Appendix A Photos).


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3.2.1 July 29 to August 04, 2007


MAX TEMP : 22.9 °C

MAX TEMP. DATE Aug.3 2007

MIN TEMP : 3.5 °C

MIN TEMP. DATE Aug.4 2007

PRECIP ACCUMULATION

22.6 mm


• Safety meeting on-site to discuss usage of manlift. • Manlift was utilized to lift worker to bottom of bridge decks to secure deck

panels to steel girders using a 6 inch threaded lag bolt. Four bolts per deck were inserted.

• Imported fill material was located on the high chain side and was deposited and compacted to build up the approach elevations to the existing bridge height and tie into engineered drawings of the road flare.

Environmental Issues/Concerns • No environmental issues or concerns noted today, crew was aware to not drop

anything into river or to drive manlift in any wetted areas. July 30-August 04, 2007 Construction Activity

• High chain fill and compaction continued. McElhanney started testing compaction to ensure adequate density was being achieved.

• Raincoast crane lifted log debris that was hung up on central pier grouping from high water event and placed it on adjacent gravel bar.

• Rescue boat relocated to More Canyon.


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• Silt fencing installed on high chain fill areas to prevent the introduction of deleterious materials into the Iskut River.

• High chain temporary piles cut off as per Formula Site Construction Plan-Remediation Plan. Sigfusson Environmental Monitor on site for cutting of piles.

• Lock blocks, compactor and other construction materials transported off site as they are required elsewhere.

• Riprap armouring stockpiled on high chain approach, to be keyed in at a later date.

• Welders working on central pier grouping continuing to weld in sheeting between piles.


• Site cleaned and garbage taken offsite. • Formula Site Construction Plan-Remediation Plan followed to ensure that cutting

of piles completed in a way to ensure environmental sensitivity. • All waste material from pilings removed from riparian areas and Iskut River

gravel bar.

• Silt fencing installed as a preventative action to stop any potential contamination of the Iskut River by silt-laden runoff.

3.2.2 August 04 - 26, 2007 *****DFO STOP WORK ORDER ISSUED UNTIL FURTHER NOTICE*****


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3.2.3 August 26 to September 01, 2007


MAX TEMP : 18.6 °C

MAX TEMP. DATE Aug.28 2007

MIN TEMP : -0.5 °C

MIN TEMP. DATE Aug.28 2007

PRECIP ACCUMULATION

17 mm

August 31, 2007 Construction Activity

• Remaining temporary work piles are removed as per Formula Site Construction Plan-Remediation Plan. Piles are hand dug and cleared to allow for cutting with torch. Piles are cut down to a depth of 1 meter below the existing gravel bar surface. All exposed pile holes and pile remnants are backfilled with appropriate fill material and contoured.


• No environmental issues or concerns noted today


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3.2.4 September 02 to September 08, 2007


MAX TEMP : 14.9 °C

MAX TEMP. DATE Sep.2 2007

MIN TEMP : -0.1 °C

MIN TEMP. DATE Sep.7 2007

PRECIP ACCUMULATION

6.6 mm

September 02, 2007 Construction Activity

• Completion of all remaining remediation works as stated in the Formula Site Construction -Remediation Plan that included the removal of the remaining concrete lock blocks and bubble curtain from the Iskut River.

• Westcan’s Doug Stokes on-site to monitor all instream works and to sample turbidity.

• The excavator was visually inspected for leaky hoses and fittings. The excavator tracks were cleaned and walking lumber pads were utilized on the dry gravel bar minimizing its footprint.

• Once at the rivers edge the excavator lifted the two lock blocks and bubble curtain out with slow controlled lifts. The resulting sediment discharge was minimal and recorded later in this report under turbidity monitoring (see Appendices A and B). No fish were observed in the area during the removal of the construction materials


• Walking the excavator along the gravel bar had limited impacts, these impacts were kept to a minimum by the cleaning of the tracks and walking the machine on the lumber pads.

• Turbidity was kept low by slow and controlled lifts and the use of silt fencing around the concrete blocks as described in the Remediation Works Plan.


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September 03 - September 06, 2007 Construction Activity

• Bubble curtain is shipped off site on a low bed. • A trail was built to access bridge abutment on high chain side for installation

of fill and riprap. • High chain abutment is sloped matching engineered grades and then armoured

with riprap. • Riprap is keyed in to meet site plan criteria • Silt fences installed at toe of riprap armouring of high chain abutment.

Environmental Issues/Concerns • No instream works, no concerns were noted.

• Silt fencing installed on downstream side of high chain abutment as a preventative measure. September 07-08, 2007 Construction Activity

• High chain approach finished and excavator brought to low chain side. • A trail was built to access low chain pier and abutment. • Grass seed applied to high chain bridge approach.


• No environmental issues or concerns noted during this period.

• Grass seed was applied to the high chain bridge approach as a future erosion control measure.


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3.2.5 September 09 to September 15, 2007


MAX TEMP : 19.3 °C

MAX TEMP. DATE Sep.12 2007

MIN TEMP : -1.3 °C

MIN TEMP. DATE Sep.12 2007

PRECIP ACCUMULATION

5.2 mm

September 09-12, 2007 Construction Activity

• Riprap work completed on low chain approach, the fill was layered and compacted and riprap was placed as a protective measure

• Filter cloth was placed between riprap and all fill and natural areas. • Archaeologist Mike Wills was on site to re-establish fencing around the

chance finds archaeological sites found near the Iskut Bridge location. • An extensive site clean up was conducted removing all wooden waste, scrap

steel and geotextile cloth and disposed off site

Environmental Issues/Concerns • The archaeological sites fence was repaired by Mike Wills to protect any

historical areas or artifacts located within its boundaries.

• A site clean up was conducted to remove all waste materials to improve safety and clear the site of all debris.

4.0 FINAL SITE AUDIT A final environmental site audit was carried out on September 20, 2007. The audit consisted of examining general site conditions and site-specifics: stream channel and banks, sediment and erosion control measures, and further actions required. No significant environmental concerns were noted during the final audit. The site still required seeding, as the earthworks contractor


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had not completed this task to date. For further details, refer to Appendix D for the Final Inspection Environmental Checklist. 5.0 REFERENCES Formula Pile and Bridge Ltd. 2007: Site Construction plan-Remediation Works. Prepared for

GCMC Resources Ltd. Contract GC05A. Prince George B.C. The Weather Network, 2007: Historical records dated May 20 to Sept 12, 2007 from Bob Quinn

Lake weather station. http://www.theweathernetwork.com referenced October 31, 2007. Westcan Projects Ltd., 2007: Additional mitigation works for pile driving within the Iskut River,

Galore Creek Mine Access Road. Prepared for Formula Pile and Bridge Contractors Ltd and GCMC Resources Inc. Contract GC 05A. Prince George, B.C.

Westcan Projects Ltd., 2007: Concrete wastewater management plan, Iskut River, Galore Creek Mine Access Road. Prepared for Formula Pile and Bridge Contractors Ltd and GCMC Resources Inc. Contract GC 05A. Prince George, B.C.

Westcan Projects Ltd., 2007: Contingency plan for pile driving outside the designated timing window for the Iskut River Crossing, Galore Creek Mine Access Road. Prepared for Formula Pile and Bridge Contractors Ltd and GCMC Resources Inc. Contract GC 05A. Prince George, B.C.

Westcan Projects Ltd., 2007: Emergency site isolation and flood mitigation plan for the Iskut

River crossing, Galore Creek Mine Access Road. Prepared for Formula Pile and Bridge Contractors Ltd and GCMC Resources Inc. Contract GC 05A. Prince George, B.C.

Westcan Projects Ltd., 2007: Standard operating procedures for the removal of temporary piles

at the Iskut River crossing, Galore Creek Mine Access Road. Prepared for Formula Pile and Bridge Contractors Ltd and GCMC Resources Inc. Contract GC 05A. Prince George, B.C.


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APPENDIX A – PHOTOS

Photo 1: May 17, 2007 - Overview photo of crossing footprint taken from the helicopter facing upstream.

Photo 3: Photo of existing gravel bar substrate composition detailing fish and fish habitat.

Photo 5: Photo of bubble curtain and lock block substructure taken from the helicopter facing downstream.

Photo 2: Photo of the Iskut river back channel located on the high approach.

Photo 4: Photo of initial bubble curtain installation over existing pier group location

Photo 6: Photo of bubble curtain and concrete lock blocks footings during high water.


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Photo 7: Photo of bubble curtain upturned by high water flows.

Photo 9: Photo of crew installing temporary bridge piles as per revised plan.

Photo 11: Photo of partially completed temporary work platform.

Photo 8: Photo of crew removing concrete lock blocks as a result of high waters.

Photo 10: Photo of temporary pile being driven with the bubble curtain encasement.

Photo 12: Photo of crew working on the low chain approach abutment.


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Photo 13: Photo of completed work platform on high chain abutment.

Photo 15: Photo of crane driving main pier group with bubble curtain.

Photo 17: Photo of bubble curtain being deployed while pile driving.

Photo14: Photo of concrete formwork completed on low chain approach.

Photo 16: Photo of crew removing concrete lock blocks as a result of high waters.

Photo 18: Photo of CO2 tank and diffuser readily on hand in case of emergency.


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Photo 19: Photo of EM taking turbidity readings while pile driving.

Photo 21: Photo of high chain abutment driven to elevation.

Photo 23: Photo of dolphin pile being welded into place onto permanent pier grouping.

Photo 20: Photo of permanent pier grouping 90% complete.

Photo 22: Photo of crew driving low chain abutment piles.

Photo 24: Photo of bridge launch commencing from the low chain abutment.


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Photo 25: Photo of crew compacting fill for the jump span approach on low chain.

Photo 27: Photo of Koehring crane with absorbent pads beneath it to absorb the seeping oil from carriage house.

Photo 29: Overview photo of steel pile and concrete lock blocks to be removed.

Photo 26: Photo of completed steel launch taken from the low chain approach.

Photo 28: Photo of riprap placement on low chain abutment.

Photo 30: Over view photo of pile cut down beneath existing.


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Photo 31: Overview photo of steel girders spanning the entire channel.

Photo 32: Photo of completed steel launch taken from the low chain approach.


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APPENDIX B – TURBIDITY MONITORING RESULTS

Turbidity Monitoring Table – Iskut River Date Description of

instream works and location (i.e.

pier/pile nos., riprap, abutment)

Time Upstream Reference Turbidity (NTUs)

Downstream

Turbidity (NTUs)

Distance from

instream works (m)

Duration of

increased turbidity

Additional Mitigation

Required? (Y/N)

2-06-07 Control tests U/S and D/S of crossing

260 250 5-10m N/A N/A

15-06-07 Pile driving

Temp (#1) All day

212

N/A 5-10m N/A N/A

15-06-07 Pile driving Temp (#1)

All day

212 199 5-10m N/A N/A

15-06-07 Pile driving Tenp (#1)

All day

212 200 5-10m N/A N/A


All day

212 200

5-10m N/A N/A


All day

212 226

5-10m Less than 10 minutes

None as within DFO range tolerance


All day

212 198

5-10m N/A N/A


All day

212 230




All day

212 199

5-10m N/A N/A


All day

212 212

5-10m N/A N/A


Temp (5 and 6) All day

232 N/A 5-10m N/A N/A

16-06-07 Pile driving Temp (5 and 6)

All day

232 227

5-10m N/A N/A


All day

232 252




All day

232 222

5-10m N/A N/A


All day

232 272


Stopped and checked Bubble

curtain

17-06-07 Pile driving All day

289 N/A

5m N/A N/A


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Date Description of instream works and location (i.e.



Downstream

Turbidity (NTUs)

Distance from

instream works (m)

Duration of

increased turbidity


Required? (Y/N)


289 278

5-10m N/A N/A


289 292

5-10m N/A None as within DFO range tolerance


289 280

5-10m N/A N/A

17-06-07 Pile driving 289 298

5-10m N/A None as within DFO range tolerance


Temp (11 to 14?) All day

289 N/A 5-10m N/A N/A

19-06-07 Pile driving Temp (11 to 14?)

All day

289 180

5-10m N/A N/A

19-06-07 Pile driving Temp (11 to 14?)

All day

289 225

5-10m N/A N/A

20-06-07 Pile driving Temp

(15 to 17) All day

194 N/A 5-10m N/A N/A

20-06-07 Pile driving Temp (15 to 17)

All day

194 160 5-10m N/A N/A

20-06-07 Pile driving Temp (15 to 17)

All day

194 195 5-10m Les than five

minutes

N/A

22-06-07 Pile driving (#3) 14:00 146.1 N/A 5-10m N/A N/A 22-06-07 Pile driving (#3) 14:36 146.1 136 5-10m N/A N/A 22-06-07 Pile driving (#3) 15:00 146.1 142.7 5-10m N/A N/A 22-06-07 Pile driving (#3) 15:12 146.1 137.7 5-10m N/A N/A 22-06-07 Pile driving (#3) 15:31 146.1 131.3 5-10m N/A N/A 22-06-07 Pile driving (#3) 16:07 146.1 142.9 5-10m N/A N/A

23-06-07 Pile driving (#1) 11:00 136.7 130.2 5-10m N/A N/A 23-06-07 Pile driving (#1) 13:13 136.7 131.7 5-10m N/A N/A 23-06-07 Pile driving (#1) 13:28 136.7 N/A 5-10m N/A N/A 23-06-07 Pile driving (#4) 16:12 136.7 126.1 5-10m N/A N/A 23-06-07 Pile driving (#4) 16:23 136.7 131.2 5-10m N/A N/A 23-06-07 Pile driving (#4) 16:31 136.7 130.3 5-10m N/A N/A 23-06-07 Pile driving (#4) 16:42 136.7 127.8 5-10m N/A N/A


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Date Description of instream works and location (i.e.



Downstream

Turbidity (NTUs)

Distance from

instream works (m)

Duration of

increased turbidity


Required? (Y/N)

23-06-07 Pile driving (#4) 16:49 136.7 130.6 5-10m N/A N/A 23-06-07 Pile driving (#4) 17:00 136.7 131.3 5-10m N/A N/A 23-06-07 Pile driving (#4) 17:10 136.7 133.3 5-10m N/A N/A 23-06-07 Pile driving (#4) 17:22 136.7 N/A 5-10m N/A N/A 23-06-07 Pile driving (#4) 18:40 136.7 126.1 5-10m N/A N/A 23-06-07 Pile driving (#4) 18:46 136.7 129.3 5-10m N/A N/A

24-06-07 Pile driving (#1) 13:00 135.5 131.4 5-10m N/A N/A 24-06-07 Pile driving (#1) 13:38

135.5 121.3 5-10m N/A N/A

24-06-07 Pile driving (#1) 14:41

135.5 118.2 5-10m N/A N/A

24-06-07 Pile driving (#1) 15:04

135.5 123.4 5-10m N/A N/A

24-06-07 Pile driving (#1) 15:12

135.5 122.9 5-10m N/A N/A

24-06-07 Pile driving (#2) 17:31

135.5 116.8 5-10m N/A N/A

24-06-07 Pile driving (#2) 17:41

135.5 124.2 5-10m N/A N/A

24-06-07 Pile driving (#2) 17.58

135.5 135.7 5-10m N/A N/A

26-06-07 Pile driving (#4) 10:38 122.4 N/A 5-10m N/A N/A 26-06-07 Pile driving (#4) 10:49 122.4 120.5 5-10m N/A N/A 26-06-07 Pile driving (#4) 10:57 122.4 120.9 5-10m N/A N/A 26-06-07 Pile driving (#4) 11:07 122.4 123.4 5-10m Les than 5

minutes Not Needed

26-06-07 Pile driving (#4) 11:12 122.4 118.4 5-10m

02-09-07 Removal of Bubble Curtain – 16.5km

11:50 55.6 55.3 4 m Less than 10 minutes

Not Needed


12:50 52.1 58.5 4 m

Less than 10 minutes

Not Needed


1:15 54.5 51.1 4 m

Less than 10 minutes

Not Needed

02-09-07 Removal of Bubble Curtain – 16.5km Devil’s Creek FSR

2:30 48.2 49.1

4 m Less than 10 minutes

Not Needed


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APPENDIX C – PH MONITORING RESULTS

PH MONITORING FORM – ISKUT RIVER

Date Description of concrete works

and location

Approx.Time

Upstream Benchmark Reference pH value

Downstream pH value

Sump Discharge pH value

Excavation pH value

23-06-07 Low chain abutment mud

sill pour

08:52

8.22 8.56 9.93 7.42


sill pour

09:10 8.22 9.25

12.50 12.29


sill pour

09:30 8.22 9.45 12.87 12.83


sill pour

09:40 8.22 9.07 Dry 12.83


sill pour

09:50 8.22 8.72 Dry Dry


sill pour

10:00 8.22 9.38 Dry Dry


sill pour

10:10 8.22 8.82 Dry Dry


sill pour

10:20 8.22 9.33 Dry Dry


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APPENDIX D – FINAL INSPECTION ENVIRONMNETAL CHECKLIST


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Documents

Iskut River Post Construction Report - a100.gov.bc.caa100.gov.bc.ca/.../documents/r16207/IskutRiverPostConstructionRep… · information, this report will also address any changes